54 lines
1.9 KiB
C
54 lines
1.9 KiB
C
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///////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2018 martysama0134. All rights reserved.
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//
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// This code is licensed under the MIT License (MIT).
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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///////////////////////////////////////////////////////////////////////////////
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#pragma once
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#include <cmath>
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#include <exception>
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namespace msl
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{
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//! @brief msl::truncate_error struct
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struct truncate_error : std::exception
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{
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const char * what() const noexcept override { return "MSL::Truncate Cast Exception"; }
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};
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//! @brief msl::truncate_cast truncate with no check
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template <class T, class U> constexpr T truncate_cast(U u)
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{
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return static_cast<T>(std::trunc(u));
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}
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//! @brief msl::truncate: truncate and throw msl::truncate_error if check fails
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template <class T, class U> constexpr T truncate(U u)
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{
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auto t = truncate_cast<T>(u);
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if (static_cast<U>(t) != std::trunc(u))
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throw truncate_error();
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return t;
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}
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//! @brief msl::integral_cast: from floating points to integral types only and throw msl::truncate_error if check fails (slight faster than truncate)
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template <class T, class U> constexpr T integral_cast(U u)
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{
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auto t = static_cast<T>(u);
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if (static_cast<U>(t) != std::trunc(u))
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throw truncate_error();
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return t;
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}
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//! @brief more meaningful cast between dynamic_cast and static_cast
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template <class T, class U> constexpr T inherit_cast(U && u) noexcept
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{
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return static_cast<T>(std::forward<U>(u));
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}
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} // namespace msl
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